Final answer:
Avoiding websites with adult content, hiding passwords, and not downloading attachments sent by strangers promote healthy use of electronic devices.
Step-by-step explanation:
The strategy that will most likely promote the healthy use of electronic devices is option C: **avoiding websites with adult content**. This is important because exposure to adult content can have negative effects on mental and emotional well-being. Additionally, it is important to practice safe online behaviors such as **hiding passwords from others** and **not downloading attachments sent by strangers** to protect personal information and prevent cyber threats.
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